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Eheh! And you're expecting and ID from me.....
It is Terrellia alright, the serratulae-species complex.
Three species in western Europe, I'm not entirely sure if there are more in this complex in Turkey. It's not T. fuscicornis, for that one has the third antennal segment black.
But it can be either T. serratulae or T. longicauda, males are practicaly inseperable, females however are separable.
For the males you need to look at the genitalia, hte hairs on the surstyli are mostly longer in T. longicauda and shorter in T. serratulae, but you need reference material and it is not always clear, so you'll need a series of males. So for the next time: collect females!;)

John